<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>demo</title>
  <script src="https://cdn.jsdelivr.net/npm/vue"></script>
</head>
<body>

<div id="app">
  <h2>{{ message }}</h2>
</div>

<script>

  var app = new Vue({
    el: "#app",
    data: {
      message : 'Hello World!'
    }
  })
</script>
</body>
</html>
